[CI] Upload the NAR package when pushing a tag

[BewareMyPower]

No description provided.

[github-actions]

@BewareMyPower:Thanks for your contribution. For this PR, do we need to update docs?
(The PR template contains info about doc, which helps others know more about the changes. Can you provide doc-related info in this and future PR descriptions? Thanks)

[BewareMyPower]

An example run: https://github.com/BewareMyPower/kop/actions/runs/7357165859

It only packages the NAR file, not including the oauth-clients and kafka-payload-processor packages, which should be used by importing a dependency to Maven.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (aa2f171) 16.98% compared to head (003e6b3) 16.98%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2035   +/-   ##
=========================================
  Coverage     16.98%   16.98%           
  Complexity      730      730           
=========================================
  Files           191      191           
  Lines         14310    14310           
  Branches       1339     1339           
=========================================
  Hits           2430     2430           
  Misses        11704    11704           
  Partials        176      176